class Spec:
	""" This class is made to hold the specification os which is to be draw
	
	Fields:
	* shape: a string in [line, circle, polygon]
	* trace: a string in [normal, dotted, dashed]
	* color: a list of strings which components can be [double, red, blue, green]
	...
	
	"""
	#Add fields dinamically
	
	pass
